Wall-caliper



H. C. METZGER.

WALL CALIPER.

APPucATxoN min APR.22. 1919.

Patented 0615.111920.

UNITED STATES HARRY o. METZGEE, or Los ANGELES., CALIFORNIA, AssiGNon or ONE-HALE rro MORRIS A. DAVIS, or Los ANGELES, CALIFORNIA.

lPATENT oFFicE.

WALL-CALIPER.

Specification of Letters Patent.

Patented Oet.,19, 1920.

Application filed April 22, 1919. `Serial No. 291,871.

To all fw hom t may concern Be it known that I, HARRY C. METZGER, a citizen of the United States, residing at Los Angeles, in the county of LosAngeles and State of California, have invented new and useful improvements in fall-Calipers, of which the following is a specication.

My object is to make a wall caliper and my invention consists of the noyel features herein shown, described and claimed.

Figure 1 is a perspective showing a wall caliper embodying the principles Oi' my in vention in the use.

F ig. 2 is a fragmentary sectional detail o the wall caliper and showing the use of the depth gage upon the caliper.

rfhe handle bar 1 is preferably straight and has a handle 2 upon its outer end. An

arm 3 extends from the handle bar 1 near the handle 2. The second bar 4 extends from the lower end of the arm 3 parallel with the handle bar 1. A head 5 is formed upon the handle bar 1 at the opposite end from the handle 2 and a finger extends upwardly from the end of the second bar 4 in line with the head 5, there being a finished edge 7 upon the finger 6 parallel with the handle bar 1 and the bar 4. The rear face 8 of the finger 6 is straight and the lower face 9 of the bar 4 is straight and at right angles to the face 6. The bar 4 along the edge 9 has graduations 10 reading from the :face 8 so as to serve as a depth gage to indicate the depth from the end face to the point in the wall at which the caliper operates.

A sleeve 11 extends upwardly .from the head 5 and has a closed upper end 12 form ing a spring seat. An expansive coil spring 13 is placed in the sleeve 11 against the spring seat. A plunger 14 is inserted upwardly through the spring 13 and through the spring seat 12 and has an enlargement 15 to torni a second spring seat. A bushing 16 is screwed upwardly around the lower end of the plunger 14 into the head 5. The sleeve 11 has a graduated face 16. A nut 17 is screwed upon the upper end of the plunger 14. A gage 18 is placed around the Sleeve 11 with the plunger 14 extending through the head 19 of the gage and a nut 2O is applied to the plunger 14 against the head 19 to connect the gage 18 to the plun ger. A long slot 21 is formed in the sleeve 11. A bifurcated bearing 22 extends upwardly from the handle bar 1 near its outer end. A lever 23 is placed in the bifurcation and a screw 24 is inserted through the bearing and through the lever to pivot the lever in place. The inner end of the lever 23 extends through a notch 25 in the lower edge of the gage 18 and through the slot 21 into the sleeve 11 and into a notch 26 in the enlargement 15 ofthe plunger 14. A handle 27 is formed upon the lever 23 near the handle 2 so that when the operator grasps the handle 2 he may place his thumb upon the handle 27 and press down, thereby raising the plunger 14 against'the tension of the spring 13.

The lower edge 28 of the gage 18 normally rests upon the head 5. A notch 29 is formed from the edge 28 to expose the lower end of the face 16 and a straight edge 30 is formed at the top of the notch 29 and the graduations 31 are covered by the straight edge 30 when the gage 18 is down in its normal position and at this time the end face 32 of the plunger 14 is against the edge 7 of the finger 6 and the caliper reads nothing. The gage 18 is adjusted in relation to the plunger 14 and goes up and down with the plunger.

Vhen it is desired to measure the thick-V ness of the wall 33 of the pipe 34 the operator grasps the handle 2 pressing down on the handle 7 and moves the plunger 14 away from the edge 7, then the caliper is Operated to pass the bar 4 into the opening 35 in the pipe to the desired depth, then the handle 27 is released and the spring 13 moves the plunger end 32 against the outer face of the wall 33 and the thickness of the wall may be read upon the graduations 31 registering with the edge 30, and the depth from the edge 36 of the pipe may be read upon the graduations 10.

When it is desired to caliper the thickness of the wall 37 and the depth of the bore 38 as in Fig. 2, the caliper is inserted and the face 8 strikes the bottom 39 and the depth is read upon the graduations 10 in line with the edge 40 and the thickness of the wall `is read upon the graduations 31 registering with the straight edge 30.

Thus I have produced a wall caliper which will readily indicate the thickness of a wall at a given depth or which will readily indicate the depth of a bore and the thickness of the wall at that depth.

Various changes may be made without handlebar adapted to engage said plunger to `move it against the action of its seating Spring, a secondary bur extending down- Wardly from said hendlebar und parallel therewith, having at its outward end n vertieally extending finger, Suid linger being in axial elinement with said plunger, said lust mentioned secondary bar having u distance scale throughout its length.

In testimony whereof I have signed my name to this specification.

HARRY C. METZ GER. 

